International Journal of Electrochemical Science
·
2023
·
IF 1.5
Bobo Hu,Nana Zhang,Huihui Li,Chong Sun
Sensitive and reliable quantification of histamine (His) is essential to ensure food safety. In this study, a sensing material consisting of reduced graphene oxide/polypyrrole (rGO-PPy) composites is successfully prepared by a two-step synthesis method and verified by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Based on rGO-PPy, an electrochemical method is established, and the electrochemical behaviours are studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). The experimental parameters, such as the detection method, the concentration and volume of rGO-PPy modified on GCE, and the pH value of the buffer solution, are optimized. Under the optimized conditions, the linear equation of the electrochemical sensor to His is I (μA) = 0.01047c + 0.1842 (R 2 = 0.9970) with a linear range of 10~800 μM, and the detection limit is 3.01 μM. Practical samples are also detected, which proves that the sensor has great application prospects. Therefore, this idea and method will make an excellent contribution to food safety.
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高影响因子
MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Jintao Liang,Fei Guo,Jiaying Huang,Xiaohong Tan,Lixian Sun,Zhide Zhou,Guiyin Li
Golgi protein-73(GP73) is one of the most common biomarkers with outstanding sensitivity and specificity in the diagnosis of hepatocellular carcinoma. Herein an ultrasensitive label-free electrochemical aptasensing platform was constructed for GP73 detection based on reduced graphene oxide-ferrocene formic acid-tripterythrine tetroxide nanocomposites (RGO-Fc-Mn 3 O 4 ) and GP73 aptamer (GP73 Apt ). Gold@poly-o-phenylenediamine (Au@PoPD) was electrodeposited on the surface of screen-printed electrode (SPE) as the conductive substrate. RGO-Fc-Mn 3 O 4 was then drop-coated on Au@PoPD/SPE as a signal probe to generate measurable redox peaks due to the electroactivity of Fc in RGO-Fc-Mn 3 O 4 . GP73 Apt was anchored on the surface of RGO-Fc-Mn 3 O 4 NPs/Au@PoPD/SPE to constitute an electrochemical aptasensing biosensor. When GP73 was captured via the specific affinity of GP73 Apt and formed GP73-GP73 Apt complex onto the aptasensing platform, the formation GP73-GP73 Apt complex impeded the electron transfer on the electrode interface, resulting in a decrease in the peak current recorded by differential pulse voltammetry method. Thus, GP73 can be detected by measuring the change of Fc redox peak current in RGO-Fc-Mn 3 O 4 . Log-linear calibration curve for GP73 concentration (0.01–1000 ng/mL) was obtained with good correlation coefficients of 0.99485 and a lower limit of detection of 0.01 ng/mL. The human serum samples were tested by direct detection method, and the relative error and relative standard deviation are 4.21–9.87% and 3.28–9.40%, respectively. All these results demonstrate that the proposed aptasensor would be a promising tool for clinical analysis of GP73 in the diagnosis of hepatocellular carcinoma.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 38
·12999-13009
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IF 6.4
Jinjuan Li,Jing Hu,Nan Li,Miao Cheng,Tao Wei,Qianqian Liu,Ruirui Wang,Wanfei Li,Yun Ling,Yafei Zhang,Bo Liu
Conventional metal oxide semiconductor gas sensors often suffer from high operating temperatures, low selectivity, and complex synthesis processes for NO2 detection. In this work, reduced graphene oxide (rGO) nanosheets are coated on NaOH-etched Cu2O/CuO urchin-like spheres to form Cu2O/CuO@rGO composites via a one-step green synthesis method at room temperature (RT). The gas sensor based on this material has been utilized for detecting NO2 at RT (25 °C), and the effects of Cu2O addition and reaction time on the morphology as well as gas-sensing properties of the as-prepared sensor are investigated. Of interest, the sensor based on the 550Cu2O/CuO@rGO-5 composite has an ultra-high response (S = 871) to 5 ppm NO2 gas at RT with a response/recovery time of 32/73 s, and the detection limit is as low as 90.6 ppt. In addition, the gas sensor shows excellent selectivity and repeatability. The excellent sensing performance of the as-prepared 550Cu2O/CuO@rGO sensor is attributed to the framework structure of Cu2O/CuO@rGO, the urchin-like hierarchical structure of the Cu2O/CuO and the synergistic effect of the p–p (Cu2O–CuO) heterojunction. This exploration of the present work offers a good reference for mass, green, and low-power sensing material preparation.
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Catalysts
·
2023
·Vol. 13
·期 6
·1012
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IF 3.9
Jia Wang,Yongfu Lian
The poor conductivity and instability of layered dihydroxides (LDHs) limit their widespread application in oxygen evolution reaction (OER). In this study, the composite electrode of NiMn-LDHs, reduced graphene oxide (rGO) and nickel foam (NF), i.e., NiMn-LDHs/rGO/NF, was prepared by a hydrothermal method. When subjected to oxygen evolution reaction (OER) catalytic performance in a solution of 1 M KOH, the NiMn-LDHs/rGO/NF composite catalyst exhibited an overpotential of only 140 mV at a current density of 10 mA cm−2and a Tafel slope of 49 mV dec−1, which is not only better than the comparing RuO2/NF catalyst, but also better than most of the Mn-based and the Ni–Fe-containing bimetallic OER catalysts reported in the literature. The excellent electrocatalytic performance is ascribed to the efficient integration of ultrathin NiMn-LDH sheets, thin-layered rGO and NF, contributing significantly to the decrease in charge transfer resistance and the increase in electrochemically active surface area. Moreover, NF plays a role of current collector and a role of rigid support for the NiMn-LDHs/rGO composite, contributing extra conductivity and stability to the NiMn-LDHs/rGO/NF composite electrode.
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高影响因子
VACUUM
·
2022
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IF 4.11
Yuhuai Shi,Shuaida Zhu,Jia Guo,Peng Deng,Haixia Zhao,Zhixian Wei,Xiong Cao
In this paper, we investigated the effect of Iron carbide-nitride/reduced graphene oxide composites (FeC x N y /rGO) as catalysts on the thermal decomposition of energetic molecular perovskite (H 2 dabco)[M(ClO 4 ) 3 ] (DAPs, M = Na + , K + and NH 4 + for DAP-1, -2, and -4). FeC x N y /rGO were fabricated by two-step method combined with chemical synthesis and sinter technology of Prussian blue/reduced graphene oxide (PB/rGO). The morphology and structure of FeC x N y /rGO were characterized. The thermal decomposition performance of DAPs with FeC x N y /rGO catalyzed were studied. Results showed that FeC x N y particles with mainly Fe–C and Fe–N bonds involved were located at the surface of rGO nanosheets , the peak thermal decomposition temperature and the apparent activation energy of DAPs were both significantly decreased in the presence of FeC x N y /rGO. Among them, with 5 wt% FeC x N y /rGO-2 added, the peak temperature of DAP-1, DAP-2, and DAP-4 have been decreased by 104.8 °C, 110 °C and 102.2 °C, respectively. Their apparent activation energy decreased significantly by 4.0 kJ/mol, 74.9 kJ/mol and 66.9 kJ/mol, respectively. A possibly thermal catalysis decomposition mechanism was provided. This work provides a new idea for design and fabrication of multifunctional catalysts to enhance the thermal decomposition of energetic molecular perovskite and offers the possibility of applying DAPs to rocket solid propellant .
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2022
·Vol. 40
·期 11
·1441-1450
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IF 3.815
Tong Li-Fen,He Liang,Zhan Chen-Hao,Xia Yun-Qing,Liu Xiao-Bo
High-quality film capacitors are widely used in many fields such as new energy vehicles, electronic communications, etc., due to their advantages in wide frequency response and low dielectric loss. The dielectric film is a crucial part of the film capacitor, and its properties have an important impact on the performance and use conditions of the film capacitor. In this work, a novel high-temperature-resistant dielectric film was prepared. Firstly, the Bi 2 S 3 /rGO-CN fillers were prepared by hydrothermal method combined with cyanation treatment, and then added to the poly(arylene ether nitrile) (PEN) matrix to prepare the dielectric film materials (PEN/Bi 2 S 3 /rGO-CN). After high temperature treatment, the fillers Bi 2 S 3 /rGO-CN reacted with the PEN matrix, and the composites materials transformed into a thermosetting hybrid film (PEN-Bi 2 S 3 /rGO) with gel content of 97.88%. The prepared hybrid dielectric films did not decompose significantly before 400 °C, and showed a glass transition temperature ( T g ) of up to 252.4 °C, which could increase the effective use temperature of the materials. Compared with the composite films without heat treatment, they exhibit better mechanical properties, with further improvement in tensile strength and elastic modulus, and a decrease in elongation at break. The dielectric constant of the hybrid films can be up to 6.8 while the dielectric loss is only about 0.02 at 1 kHz. Moreover, the hybrid films showed excellent dielectric stability during temperature changes, and remain relatively stable before 250 °C, which is suitable as a high-temperature-resistant high-dielectric material and is more advantageous for practical applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 52
·78874-78886
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IF 5.19
Xu Junge,Hu Die,Wang Yingmu,Zhang Ziwei
Ciprofloxacin (CIP) is a third-generation fluoroquinolones (FQs) antibiotic, and the occurrence of CIP in the water environment has raised growing concerns owning to its environmental toxicity. In this paper, a novel α-(Fe, Cu)OOH/RGO nanocomposite was synthesized via a one-step reflux method for CIP degradation through a photo-Fenton-like process. When the RGO content was 1 wt%, CIP degradation ratio by the α-(Fe, Cu)OOH/RGO nanocomposite reached 100% under visible light irradiation within 120 min, and total organic carbon (TOC) removal ratio reached 60% within 180 min. The result of molecular fluorescence spectra highlighted that the loading of RGO on the α-(Fe, Cu)OOH significantly increased the content of hydroxyl radicals (·OH) in the heterogeneous photo-Fenton-like system and simultaneously inhibited the recombination of photogenerated electron and hole, which played critical roles in the enhancement of CIP degradation. In addition, 11 main intermediates were identified as the degradation products of CIP in the α-(Fe, Cu)OOH/RGO/H 2 O 2 /visible light reaction systems using liquid chromatograph–mass spectrometer (LC-MS) analyses. The results demonstrated that three degradation pathways for CIP removal by α-(Fe, Cu)OOH/RGO nanocomposite occurred, including (i) oxidation on the piperazine ring and dealkylation, (ii) defluorination and decarboxylation, and (iii) hydroxylation on the quinolone ring. This work would provide a novel insight of CIP degradation pathways in photo-Fenton-like processes. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
·
IF 10.319
Qian Liu,Liang Tang,Jinzhe Li,Yao Chen,Zhengkang Xu,Jiatong Li,Xinyu Chen,Fanbin Meng
Although lightweight and three-dimensional (3D) graphene aerogels are highly desirable for microwave absorption (MA) due to their high porosity, specific surface area, and 3D conductive network, it still remains a large challenge to construct a multifunctional application framework to quickly adapt to the complex practical environment, making it to be efficiently applied in a variety of complex situation. Herein, multifunctional aramid nanofibers (ANFs) reinforced reduced graphene oxide aerogels (RGO@ANF) have been achieved by in-situ gel reaction, freeze-drying, and thermal annealing processes. The introduced ANFs in RGO aerogels can prevent the graphene sheets from over-stacking and enhance the connectivity of cell walls, thus leading to excellent compression resistance, MA, sound absorption, and thermal insulation performance. Under 70% strain, the maximum compressive stress of RGO@ANF aerogel reaches 78.8 kPa, and reversible compressibility with reliable resistance to fatigue for 100 compressive cycles at 20% strain. Further, the RGO@ANF aerogel exhibit a minimum reflection loss (RL min ) of –56.5 dB and a maximum effective absorption bandwidth (EAB) of 7.0 GHz at a thickness of 2.8 mm, basically covering the X and Ku bands. Moreover, the hybrid aerogel exhibited excellent sound absorption with an average absorption coefficient > 0.56 at 2-6 kHz and good thermal insulation performance with low thermal conductivity of about 49.18 mW m –1 K –1 . The integrated graphene aerogels with such multifunctional performances hold a great promise for applications such as MA, sound absorption, and heat insulation.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Desen Zhou,Jun Zhang,Zhenxing Jin,Tingmin Di,Tielin Wang
Photocatalytic CO 2 reduction has been considered as a potential way to solve the energy problem and the greenhouse effect. In this work, layered g-C 3 N 4 /rGO/NiAl-LDHs heterojunctions were prepared by using a hydrothermal method, the optimized composite exhibited enhanced photocatalytic CO 2 reduction to CO (2.6 μmol h −1 g −1 ) and CH 4 (20 μmol h −1 g −1 ) activity, which was 3.7 and 14.2 times higher than that of pure g-C 3 N 4 , respectively. According to the experimental and density functional theory calculation (DFT) results, it is believed that with the large contact interface and excellent electron mobility rGO could act as an electron transfer bridge to facilitate the rapid charge migration and separation between g-C 3 N 4 and NiAl-LDHs. Thus, driven by the internal electric field, interfacial band edge bending, as well as the type II heterostructure, the activity of g-C 3 N 4 /rGO/NiAl-LDHs could be greatly enhanced. This work provides a possible way to rational design and fabrication of rGO-assisted composite systems with type II, Schottky, S-scheme, P-N and other heterojunctions.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yu Zhang,Qiang Gao,Shuai Zhang,Xun Fan,Jianbin Qin,Xuetao Shi,Guangcheng Zhang
Combining flexible reduced graphene oxide (rGO) with highlyelectrical conductive and flame retardant MXene to prepare electromagnetic interference (EMI) shielding composite film is a research hotspot. In this work, with a small amount of polyvinyl alcohol (PVA) used as the adhesive, rGO/MXene loaded on spunlace non-woven fabric (SNF) through a soaking-drying-reduction method to form a sandwich structure composite film (SNF covered with rGO/MXene nanosheets as the interlayer, and rGO/MXene thin films as the upper and lower layers). The related EMI shielding effectiveness (SE), electric heating performance and flame retardancy of the fabricated sandwich structure composite film have been investigated. When the mass ratio of rGO to MXene is 6:4 (named rGO/MXene-4), the average SE T of the film can reach 55.81 dB in X-band with an absorption-dominant shielding. Applying a 4 V voltage to rGO/MXene-4 film, its surface temperature can exceed 110 °C within 10 s, which indicated the fabricated rGO/MXene-4 film can be applied as a high electromagnetic shielding electric heating device with outstanding flame retardancy.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Jicheng Wang,Lixiang Song,Roy Ashish,Zhonglan Cui,Chenkai Zhu,Dongming Qi
Oriented structures with peculiar effects are widespread in nature but less common among artificial general materials. In order to develop composites with uniformly dispersed and oriented inorganic particles on large scale, Polyacrylate(PAcr)@rGO microspheres were fabricated by suspension polymerization and blended with Polymethyl Methacrylate (PMMA) to form PMMA/PAcr@rGO composites via in situ microfibrillation. The structure and mechanical properties (tensile strength, elongation at break and fracture energy) of the composites were investigated by transmission electron microscopy , scanning electron microscopy and universal material testing machine. As a result, the tenacity of composites was enhanced significantly with the dispersion phase of PAcr@rGO-0.15, where the elongation at break and the fracture energy were increased by ∼300% and ∼500% when compared to pure PMMA. During the melt blending process, PAcr@rGO microspheres were deformed into microfibrils through in situ microfibrillation, and the rGO was uniformly dispersed and oriented along the stretching direction as the microfibrils evolved. With the rGO fraction within 0.2 wt%, the highest degree of deformation for PAcr@rGO microfibrils was achieved with aspect ratio of ∼68 when 0.15 wt% rGO was added. As such, the movement of rGO particles was limited and aligned with the encapsulation and deformation of PAcr microspheres, which could be a good guidance to improve the dispersion of filler with alignment controlling for functional composites.
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高影响因子
MATERIALS RESEARCH INNOVATIONS
·
2023
·
IF 0
Shridevi Salagare,Prashanth S. Adarakatti,Abdulraheem SA Almalki,Venkataramanappa Yarradoddappa
A simple protocol for the preparation of nickel–cobaltite and graphene–nickel–cobaltite composites is described in this paper. Nickel–cobaltite-reduced graphene oxide (NiCo-RGO) nanoparticles are produced by self-combustion of urea–nitrate complexant. Graphene, as expected, inhibits the nanoparticles from clumping together. The production of complex during synthesis is confirmed by electrochemical and spectroscopic analyses of the composites. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to investigate the electrocatalytic oxidation of nitrite on a (NiCo-RGO) graphite electrode. The DPV approach demonstrated a linear range of 60–860 μM, with detection limits of 18.0 μM. For nitrite determination, the method’s sensitivity was around 0.06767 μA μM−1 cm−2. Interference, stability, and repeatability were also checked on the sensor. DPV techniques were utilised to examine nitrite levels in soil and juice samples.
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